Steam-shovel.



N0. 808,452. PATENTED DEC. 26, 1905. O. HBTLESAETER. STEAM SHOVEL.

APPLICATION FILED AUG. 2s, 1905. 2 SHEETS SHEBT l 10.808,452. A PATENTBD DEC. 26, 1905. o. HBTLESAETER. STEAM SHOVBL APPLIOATION FILED AUG. 26, 1905.

2 SHEETS-SHEET 2.

f v r Y NTTED STATES PATENT OTTTCE.

CHALMERS COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

STEAM-SHOVEL.

Specification of Letters Patent.

Patented Dee. 26, 1905.

Application led August 26, 1905. Serial No. 275,967.

T0 all whom, t may concern:

Be it known that I, OLAF HETLESAETER, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of /Visconsin, have invented certain new and useful Improvements in Steam-Shovels, of which the following is a specification.

This invention relates to a power-shovel, and has for its object to improve this type of excavating or dredging machinery, especially as to relieving' the table of some of the weight of the parts by applying the power stress from above the table; also, as to providing means for operating' the dipper, including a section having a lower factor of safety, so that if breakage must occur it will be limited to that section, so that that only shall then require to be repaired; also, as to providing a simple means for the operating' parts which will avoid the use of gears. i

Other objects will appear from a full disclosure of the invention aided by the accompanying drawings, showing one type of niachine.

In the drawings, Figure 1 is a side elevation of the power-shovel. Fig. 2 is a plan view of the same. Fig. 3 is a plan view of the table with the boom removed.

The shovel is shown mounted upon a car 1, one end of whose platform constitutes a base 2, upon which is rotatably ad justably mounted a table 3. The table 3 is rotated by power means (not shown) applied through rope 31, cireumferentially mounted thereon. A frame 3, usually termed an "A-frame,is also mounted from the base 2 or car 1 and is strengthened by rods or stays 5. The frame 4 projects over the table and supports a guide-sheave 6 tangentially to the axis of the table 3 by means of bearings 61, mounted upon the frame 4 and strengthened by short links 62, connecting to the top of frame 4.

A boom 7 is mounted upon the table 3 and has attached to its head end 8 stay-rods 9, connected to a collar 10, rotatably mounted upon a vertical bearing 11 on the top of the frame 4 and in the table-axis. Upon the boom 7 is mounted a dipper 12, having an arm 13 and a bucket 14,v strengthened by braces 141. The clipper-arm 13 has a rack 143 underneath coacting with a pinion 15 on the boom 7. The pinion 15 is operated by an engine 16 on the boom 7, receiving its Steam-supply through a pipe 17, a portion 18 -middle of drum 21 and between the tWo smaller differential parts 24.

Ropes 25-are connected to the smaller differential parts 24 and coacting therewith the requisite circumferential extent extend between the parts of the boom 7 to the sheaves 22 at the head end 8, with which sheaves 22 they coact, and thence extend to the rear of the bucket 14, where they are attached to projecting ribs 26.

A rope 27 is attached to the larger differential part 23 of the drum 21, coacts circumferentially therewith, and thence extends upwardly in the axis of table 3 to guide-sheave 6, with which it coacts circumferentially, and thence leads to any convenient source of power, as a winding-engine. (Not shown.) It will be seen that by the use of this differential drum and operating-ropes a simple means for the operating parts is provided -which dispenses with the use of gears.

The rope 27 is designed of less ultimate strength than the combined strength of ropes 25, even taking into account the difference in strength due to their coaction with the differential drum 21-that is, the factor of safety of rope 27 is'made less than that of the plurality of ropes 25. The purpose is to cause breakage to be confined to rope 27 if breakage is unavoidable, so that the ropes 25 will not need to be renewed.

' rlhe location of sheave 6 at a higher level than the sheave or differential drum 21 causes the power stress or working stress induced by the winding-engine to be applied vertically upward through the section of rope 27 in the axis of table 3. This upward power stress relieves the table 3 of a part of the weight upon it, and one resulting advantage is that of less friction and power in turning table 3.

In operation the shovel is Erst properly located over the place of excavation. The dipper 12 is swung down about pinion 15 as an axis by unwinding rope 27, and consequently the dierential drum 21 and ropes 25. At the same time or subsequently the engine 16 is caused to extend the dipper by turning pinion 15, operating in rack 143. The dipper 12 is then returned by reversing the operations just stated. The table 3 is then rotated by engine operating through rope 31 and the load lin bucket 14 dumped at the desired location by dropping or swinging back the bucketbottom by well-known means.

This invention has been disclosed in accordance with the patent statutes in reference to one form of the invention; but it is desired to be understood that the invention is not limited to the form shown and that it may be carried out by other means.

INhat is claimed is# 1. In a power-shovel, a dipper, and means for operating the dipper, including a section coacting to receive upward power stress.

Q. In a power-shovel, a base, a rotatablyadjustable table, a boom on the table, a dipper swingably mounted on the boom, a rope attached to the dipper, a sheave on the boom, and a guide-sheave mounted at ahigher level stationarily as to the base, the sheaves so placed as to receive the rope and locate a section thereof in the common tangent of the sheaves and in the vertical axis of the table.

3. In a power-shovel, a dipper, and a rope for operating the dipper including a section coacting to receive upward power stress.

et. In a power-shovel, a base, a rotatablyadjustable boom, a dipper on the boom, a sheave on the boom, a guide-sheave supported on the base at a higher level than the boomsheave, and a rope attached to the dipper and coacting with the sheaves.

5. In a power-shovel, means for operating the dipper coacting to receive a power stress tending to counterbalance the weight of shovel parts.

(5. In a power-shovel, a dipper, and a rope for operating the dipper including section coacting to receive a power stress tending to counterbalance the weight of shovel parts.

7. In a power-shovel, al dipper, and means for operating the dipper, including a dierential drum.

8. In a power-shovel, a dipper, .L diiferential drum, ropes coacting' with the drum for operating the dipper and having different factors of safety.

9. In a power-shovel, a dipper, a differential drum, and means for operating the dipper including a rope coacting with one differential part of the drum and a second rope coacting with a second differential part of the drum, the ropes having different factors of safety. u

10. In a power-shovel, a dipper and means for operating the dipper includinga differential drum and a section coacting to receive upward power stress.

11. In a power-shovel, a base, a rotatablyadjustable table, a frame on the base extending over the table, a guide-sheave supported over the table by the frame tangential to the table-axis, a dipper, and operating means for the dipper including a rope leading in the table-axis to the guide-sheave.

12. In a power-shovel, a dipper.l a differential drum, a plurality of ropes connected to the dipper and coacting with the drum, and means for operating the drum.

13. In a power-shovel, a rotatable table, a dipper and a differential drum supported on the table, a plurality of ropes connected to the dipper and coacting with the drum, and means for operating the drum including a rope in the table-axis.

le. In a power-shovel, a rotatable table, a boom on the table, a dipper on the boom, fluidpressure means on the boom for operating the dipper, other means for operating the dipper including a rope-section in the axis of the table, and means for supplying Huid-pressure to the boom means and located in the axis of the table below the rope-section.

15. In an excavator', a dipper, a differential drum, and means including a rope for operating the dipper.

16. In an excavator having a boom1 a rotatable table, a dipper, a differential drum supported on the boom` and means including a roperfor operating' the dipper. 

